年間 12 号発行
ISSN 印刷: 0040-2508
ISSN オンライン: 1943-6009
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PROSPECTS OF GRADIENT GRATINGS USED IN THE TERAHERTZ LASERS
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要約
Further utilization of terahertz frequency range requires the development and improvement of radiation sources capable of operating in this range. Submillimeter lasers are one of the few sources of terahertz radiation. The use of concave mirrors in a laser cavity is often required to reduce the diffraction loss and the output laser beam divergence. However, such mirrors are much more expensive and more complicated in manufacture than the flat ones. The aim of this work is to study flat gradient metal gratings that possess the properties of spherical mirrors and lenses simultaneously. Flat gradient metal gratings in the form of concentric rings with varying parameters in the radial direction are proposed for solving the focusing problem. Simulation of the properties of a ring grating in which the distance between the rings decreases in the direction from the center to the edges is carried out. The considered grating has the properties of a concave mirror and a focusing lens simultaneously.
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